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Magnetic Tape Identification

Publishing Venue

IBM

Related People

Devore, EW: AUTHOR

Abstract

In automatic tape libraries such as shown in U. S. Patent 2,941,738, it is desirable that the magnetic tape unit receiving the magnetic tape record verify that the received tape is the one desired. In such automatic systems, the critical-path time is represented by a transfer of the magnetic tape record member from a storage compartment to the time the transducer in the magnetic tape unit is prepared for reading or recording data signals. To minimize this critical-path time, it is desirable to move promptly to the portion of the magnetic tape record containing the data signals to be read or having the area on which data signals are to be recorded.

Country

United States

Language

English (United States)

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Magnetic Tape Identification

In automatic tape libraries such as shown in U. S. Patent 2,941,738, it is
desirable that the magnetic tape unit receiving the magnetic tape record verify
that the received tape is the one desired. In such automatic systems, the critical-
path time is represented by a transfer of the magnetic tape record member from
a storage compartment to the time the transducer in the magnetic tape unit is
prepared for reading or recording data signals. To minimize this critical-path
time, it is desirable to move promptly to the portion of the magnetic tape record
containing the data signals to be read or having the area on which data signals
are to be recorded. Therefore, during automatic loading, it is desirable that the
tape, as it is loaded into the tape units, not stop until the desired transducing area
on the tape has reached the transducer of the magnetic tape unit.

In magnetic tape records of the rotary-head type, the tape record has a pair
of servo tracks with record-track identifying signals. Such track identifying
signals can be of the multifrequency type, such as indicated in the signal format
labeled "servo". In that format, a predetermined number of cycles of signals at
frequency F1 bracket an indicating signal F2. F2 is a signal of one or more
cycles having a distinctly different frequency than F1. By timing the relationship
between these two signals, a record track can be precisely located with respect
to a scanning head. In accordance with this technique, the servo signals can be
adjusted to indicate a serial number (SN) of the record member. For example, in
some tape records, a visual SN is hot-stamped on the free end of the record
tape. This same serial number is recorded in the servo tracks, as in the hatched
areas, preferably at the beginning of tape B0T and at predetermined spaced
positions along the tape length. Accordingly, when the tape is loaded into the
tape unit, it can be moved rapidly to one of the areas identifying the record
member. The serial number can be read from the servo areas and verified
against the requested number. Since the record tracks are close to such areas,
total tape-transport time can be minimized. That is, as the data area is being
approached, the tape would be normally slowed down to assure accurate
positioning. During this slowdown period, the tape serial numbers can be read
on the fly.